In the not too distant future, mankind battles over O-Parts, relics from an ancient civilization. It takes a special kind of person to unlock the full potential of these remnants from the past, and a unique breed of humans known as O.P.T.s (or O-Parts Tacticians) become a force to be reckoned with. Unfortunately, O-Parts can be used for good or evil purposes.
Jio is a young boy with a tragic past who only trusts one thing in the world: money. Little does he suspect that he is actually a very powerful O.P.T., and inside him sleeps a demon of incredible ferocity. He meets up with a girl named Ruby, and together they decide to embark on a dangerous quest to discover as many O-Parts as they can. Will Jio help Ruby realize her dream of becoming a world famous treasure hunter? More importantly, will Ruby help Jio realize his dream of--world domination?!
(Source: Viz Media)
Included one-shots:
Volume 6: Trigger

Set in a ruined world full of chimerical creatures, where female creatures eat males. Two creatures explore the land: Usagi, the elder sister, protects her brother Mitsuki, a curious chronicler who knows much about the ancient world for having read a multitude of books.

Blazer Drive is a fantasy in the near future where eco thinking has given cause to a new energy source. A tattoo-like stickers ‘Mysticker’ that gives different types of energies, ice, fire, electricity and light.

The master of the sticker called ‘Blazer’, they control/manipulate the energy to there will, by sticking it on there own body.

The Blazer’s wage battle in a futuristic fantasy.

From the Author of O-Parts Hunter

As Japan's population grows older and smaller, and murder rates sky rocket, the Japanese government began to implement stricter laws against the worst criminals. With even the death penalty lacking the deterring force to stop the most violent criminals, Japan brought back to life a law from the 19th century: the "Revenge" law. This law will now allow victims and their related parties to employ a government special forces agency to capture the murderer and reenact the exact same methods with which the victim died onto the murderer.

Yamagishi Yuji is the 7th member of the Special Forces "Sukedachi-nin." Each of the members of this special forces have been chosen to enforce the Revenge law because they too have been a victim of past crimes.

In this story, we’re treated to a twisted, gothic-horror remix of the classic Cinderella story as re-imagined by a shounen author for a shoujo audience, where we find, in the end, that nothing comes free, and if it sounds too good to be true, well, there’s usually a catch. (You’ve never seen Cinderella like this!)

All humans are wolves in sheep's clothing and the same applies to Douchinji Youichi, a boy who always daydreams about various things, but never says anything out loud. One day, upon seeing a red full moon, a girl came dashing at him before punching him with a silver knuckle, knocking him unconscious and unable to really remember the incident. The next day, a new student, Akatsuki Ayame, joins his class.
On his way home, Youichi discovers that the girl who punched him is Ayame, and her silver knuckle draws out what she calls a "wolf", a person's inner thoughts or desires, from a "sheep", the superficial mask which restrains the inner "wolf" from surfacing. However, when someone is full of desires and becomes obssessed with their inner thoughts, the "wolf" outgrows the "sheep" and the person will be able to see the World of Red Moon. The girl explains that she doesn't have a "sheep" and would like to have one, so she requests Youichi to become her "sheep". Youichi agrees to it, marking the beginning of a story of the red riding hood who devours the wolf.
(Source: MangaHelpers)